iran's president mahmoud ahmadinejad slated to talk later today at the united nations. his speech follows one from president obama, who just yesterday said the u.s. will do what it must to stop iran from developing a nuclear weapon. he said time is running out for diplomacy. >> let me be clear, america wants to resolve this issue through diplomacy. we believe that there is still time and space to do so. that time is not unlimited. >> and back to the political back and forth and dueling speeches which saw mitt romney and president obama on the same stage just hours apart. >> that's right. we want to talk more about this with margaret hoover and richard socarides. margaret is a cnn contributor, former white house appointee and bush administration. richard is a former special adviser in the clinton white house. and a democratic analyst. so, in "the wall street journal" and some other places, president obama took a little bit of heat. some people also saying that his speech was a little too campaigny, and that he di't meet with world leaders. you know, what do you say to th